Homepage › Forums › RetroPie Project › New to RetroPie? Start Here! › Upgrading pi2 3.0 beta 2 to 3? › Reply To: Upgrading pi2 3.0 beta 2 to 3?
Go to Retropie Setup, fetch the latest apt updates and the latest RetroPie Setuop Script and then do a Binary Install.
Save your modifications before you do the Upgrade (and/or even backup the complete SD card to an Image file).